Exercise treadmill



FIG. 1 is a right side elevational view of an exercise treadmillillustrating my new design, the side opposite being substantially amirror image.

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a rear elevational view thereof.

The ornamental design of an exercise treadmill, as shown and described.